System for undersea digital acoustic communications
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United States of America Patent
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-
Dec 18, 2007
Grant Date -
N/A
app pub date -
Jul 11, 2005
filing date -
Jul 11, 2005
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An undersea communications system in which a message is converted to a redundant fixed-length data packet and transmitted acoustically as a quadrature phase-keyed signal in a frequency band with a continuous pilot signal at a frequency closely adjacent to the frequency band. A receiver uses the received continuous pilot signal to Doppler compensate the incoming quadrature phase keyed signal by estimating any Doppler distortion in the received pilot signal. The resultant redundant signals are then robustly processed coherently and jointly by the adaptive decision feedback equalizer and decoder to provide the original transmitted data.
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